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@einen tatrgstrnt @Hita WILLIAM STAMP, OF SUSQUEHANNAl DEPOT, PENNSYLVANIA.

Letters PatcntNo. 62,083, dated February 12, 1867.'4 i

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"IO ALL WHOM IT MAY CON CERN:

Be it known that I, WILLIAM STAMP, of Susquehanna Depot, in the county of Susquehanna, and State of Pennsylvania, have invented a new and useful 'Improvement in Steam Gauges; and I do hereby declare that the following is a full, cl'ear, and exact description thereof, which will enable others skilled in the art to make `and use the sam-e, reference being had to the accompanying drawings, forming 'part of this specification, in

which- Figure 1 is a top View of the steam gauge.

Figure 2 is a' central section taken in the plane of the line :t x, iig. 1, showing the gauge inoperative.

Figure 3 is a similar partial section, showing the gauge when operated on by the pressure of steam.

Figure 4 is a detached view of one of the parts.'

Similar letters of reference indicate like parts. j

This invention relates to improvements in the'ccnstruction of gauges for indicating the pressure of steam in' boilers, and consists of a novel form and arrangement of a steel diaphragm or partition-plate, upon which the steam acts by expansion, and also the means of adjusting the moving apparatus of the dial to indicate the degree of pressure with minute accuracy. The diaphragm is a thin steel disk, cut out of fine sheet steel, and swaged with dies into a concave flat-bottomed or saucer-shaped form, which is set in an ordinary circular brass steam-gauge. case, the bottom of which, under the diaphragm, is made to conform thereto, with an equal steam space between them. The edge of the diaphragm is set in a shoulder on the interior of the case so as to make a perfectly steamLtight joint, and by the peculiar conformation of the diaphragm the effect of the pressure of the steam upon it tends to make the joint tighter instead of to open it, as is the case with the dat or corrugated diaphragm. The uniform expansion and contraction of my concave diaphragm from the circumference `to the centre obviates the breakin g or cracking of the steel plate, which is a common fault in diaphragms of other forms of construction subject to excessive steam pressure and action at particular points; and .the narrow steam chamber, not exceeding the sixteenth of an inch between the case and the bottom of the diaphragm, prevents all danger from injury by the freezing'of condensed steam. Ordinary steam gauges do not generally registerjthe pressure with accuracy below 20 nor above 2009, but my improved diaphragm is so delicately sensitive and uniform 1n its expansion that it will register accurately from 5 to 300 steam pressure, upon a dial properly scaled. By means of an eccentric-pin I am enabled to adjust the indicating apparatus with the nicestpreeision. A represents the steam gauge case, which is provided with the ordinary dialplate and indicator, covered by glass. B is a central cross-bar in the case, of usual or any suitable form and position for supporting the` indicating apparatus, which, as usual, consists ofan, upright, a, surmountedwith a small pinion, b, that turns the needle indicator c, by engaging in a toothed segment, d, pivoted at the lower end upon the crossbar B, within a central space, as seen in g. 1. At the lower end ofthe segment d, projects, at right angles, a short arm, e, as shown clearly in figfd; a stout, hardened steel, adjustable eccentric-pin, i, passes i through the arm e, and is fitted nicely to be turned by a screw-driver for adjustment, and held in place, when adjusted, by means of a set-screw, rt, or in any `suitable manner. Ou the lower end of the pin z's a` small nib, s, placed near the circumference, which nib bears upon the upper face ofone end of` a curved'steel lever, 1i, which is pivoted at the other end to the cross-bar B,'and sets under the segment d, so that the rounded lower end of the segment turns freely in a concave scat on the upper side of the lever k when it is moved upward by Athe pressure of the steam, as hereinafter explained. The ste'el-plate diaphragm m, theV construction of which has already been described, is turned with a perfectly square edge, Vwhich ts against a corresponding shoulder, o, turnedon the inside of the case, as shown iu iig. 2.- The plate may be s prung into placeunder the shoulder, or it may be set in by heating and expanding the case to admit it more readily"- When the diaphragm is cold and in place, a narrow steam chamber, w, will be underneath, between it and the bottom of the case, coextensive with its convex surface, to receive steam from the boiler, as usual, through an aperture, K, on one side of the case. When the diaphragm is in place, and not actedupon by steam, the indicating needle will` point to S t zero on the dial-plate, .and the free end of the pendent lever h will lie down upon the upper or concave side of the diaphragm, as seen in iig. 2, the adjustment of the needle being effected byV turning the pin t'to bring the eccentric-nib s nearer or fart-hex' from the fnlcrum of the lever z,

as required. Now when steam is admittedinto the chamber w it will press the diaphragm npward in a regular and unitorm curve, from the circumference to the centre, as indicated in red, in iig. 3? and thus push up the lever z, against the nib s, on the pin z', in the arm e, and canse the segment d to turn the pinion b, and lrnove the indicating needle c on the dial-plate to point to the degree of steam pressure.

Having thus 'fully described the Construction and operation of my invention, what I claim as new7 :md desire to secure by Letters Patent7 is- 1. I elztiln :L eeneeve at-bottomed or saueer-sheped steel-plate diaphragm, fitted in a steam gauge, and constructed substantially es herein described. v I

2. I claim also the eccentric adjusting pin z', or its equivalent7 in combination with the pendent; lever L, and the segment d, constructed and operated substantially :Ls herein described. y

The above specification `of my invention signed by lme this 25th defy of September, 1866.

W. STAMP.

Witnesses:

WM. F. MCNAMARA, ALEX. F. ROBERTS.' 

